package com.hancheng.commoncloud.framework.util;

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;

/**
 * 获得容器的bean
 *
 * @author 金笛
 * @date 2022/1/23 16:05
 * @Description:
 */
@Component
public class SpringContextUtils implements ApplicationContextAware {

    // Spring应用上下文环境
    private static ApplicationContext applicationContext;

    /**
     * @return ApplicationContext
     */
    public static ApplicationContext getApplicationContext() {
        return applicationContext;
    }

    /**
     * 实现ApplicationContextAware接口的回调方法,设置上下文环境
     *
     * @param applicationContext
     */
    @Override
    public void setApplicationContext(ApplicationContext applicationContext) {
        SpringContextUtils.applicationContext = applicationContext;
    }

    /**
     * 获取对象
     * 这里重写了bean方法,起主要作用
     *
     * @param name
     * @return Object 一个以所给名字注册的bean的实例
     * @throws BeansException
     */
    public static Object getBean(String name) throws BeansException {
        try {
            return applicationContext.getBean(name);
        } catch (BeansException e) {
            return null;
        }
    }

    public static <T> T getBean(String beanName, Class<T> beanClass) {
        if (!applicationContext.containsBean(beanName)) {
            return null;
        }
        return applicationContext.getBean(beanName, beanClass);
    }
}
